I got a new launch 21v and want to do some cold weather runs when the ice melts. After I unwinterize will i need to take it out everyday and store
It in my warehouse till it warms up? Temps
Will be in the mid 40s an 50s but in worried about
It dipping down to 30s or night seeing as how our weather is unpredictable.

If you take it out and there is a hard freeze (below 30 for 12+ hours) i would drain the block and vdrive. If it gets to 30 and then the next day is in the 50's by 10am- I wouldn't worry about it. I live in Texas (big difference than Michigan) and had a couple nights at 29-30 and didn't winterize. If we had 2-3 days where the high was 29, you bet I'd be doing it. Where's it stored?

To be safe I would keep it in your heated warehouse and trailer it each time. But if that's a hassle it only takes about 30 minutes to winterize your boat. So you might wanna just do that after you take it out every time so you can keep it in the slip and not worry about putting it back on the trailer.

whats the water temp? prolly easier and just as safe to keep it in the slip ( especially if the boat is left in the water) Even if it's on a lift...keep the lift as low in the water as possible. I'm assuming the lake is not frozen...lol. Even cold water gives off heat....

I'm not putting the boat in until the water temperature hits at 45 degrees. That way if the air temps dip near freezing I can just lower the lift. I live about an hour about NW of GR and with the forcasted temps, I am guess that the lake will be frozen til mid march. This should put my first run of the season around the second weekend in April...maybe be sooner if the weather cooperates....

Typically early season Ill keep it at my buddies on lake orion althought its now a great lake to ride on but it isnt bad when there isnt alot of people this early. If im trailering it ill probably hit up maceday lake a few others around. Orion is still part frozen but I think with the weather getting up in the 50s this week it should open up. Here is my new slingy with the 11 Reliks on it

I took a ride by Cass Lake today, the Dodge #4 State Park boat launch is completely unobstructed, as is the main body of the lake. The area by the sand bar, and the smaller bays are still thick, but I wouldn't hesitate to drop my boat in if it was ready...

First picture is the launch, and the second is the middle of the main part of the lake, taken from the park;